Triangle Calculator
Calculate the unknown sides and angles of a triangle with this versatile triangle calculator. Select your known values below.
Three Sides (SSS) Calculator
Enter the three sides of the triangle to calculate all angles and other properties.
Triangle Visualizer
Convention:
- Side a is opposite to angle A
- Side b is opposite to angle B
- Side c is opposite to angle C
Triangle Formulas
Common formulas used in triangle calculations
Heron's Formula
Area = √(s(s-a)(s-b)(s-c)) where s = (a+b+c)/2
Standard Formula
Area = (1/2) × base × height
Using Sine
Area = (1/2) × a × b × sin(C)